feat(S2-b): connect durable MQTT sync to capture workflow

FieldLogger/ViewModels/HomeViewModel.cs

@@ -4,6 +4,7 @@ using CommunityToolkit.Mvvm.Input;
 using FieldLogger.Models;
 using FieldLogger.Services;
 using FieldLogger.Services.Data;
+using FieldLogger.Services.Sync;
 
 namespace FieldLogger.ViewModels;
 
@@ -14,6 +15,7 @@ public sealed partial class HomeViewModel : ObservableObject
     private readonly PointLogger _pointLogger;
     private readonly AppDatabase _database;
     private readonly SettingsService _settings;
+    private readonly IMqttSyncService _sync;
 
     public DeviceConnectionManager Manager => _manager;
 
@@ -35,20 +37,27 @@ public sealed partial class HomeViewModel : ObservableObject
     [ObservableProperty]
     private string _fixAccuracy = "";
 
+    [ObservableProperty]
+    private string _syncStatus = "";
+
     public ObservableCollection<LoggedPoint> RecentPoints { get; } = new();
 
     public HomeViewModel(DeviceConnectionManager manager, MaglinkService gps,
-        PointLogger pointLogger, AppDatabase database, SettingsService settings)
+        PointLogger pointLogger, AppDatabase database, SettingsService settings, IMqttSyncService sync)
     {
         _manager = manager;
         _gps = gps;
         _pointLogger = pointLogger;
         _database = database;
         _settings = settings;
+        _sync = sync;
+        SyncStatus = sync.Status;
 
         _gps.FixReceived += OnFixReceived;
         _pointLogger.PointSaved += OnPointSaved;
         _pointLogger.PacketIgnoredNoJob += OnPacketIgnoredNoJob;
+        _sync.StatusChanged += OnSyncStatusChanged;
+        _sync.PointRejected += OnPointRejected;
     }
 
     /// <summary>Called from the page's OnAppearing.</summary>
@@ -146,4 +155,14 @@ public sealed partial class HomeViewModel : ObservableObject
             "A point was logged on the receiver, but no job is active so it was not saved. Create or select a job first.",
             "OK");
     }
+
+    private void OnSyncStatusChanged(object? sender, string status) =>
+        MainThread.BeginInvokeOnMainThread(() => SyncStatus = status);
+
+    private void OnPointRejected(object? sender, PointSyncFailureEventArgs e) =>
+        MainThread.BeginInvokeOnMainThread(async () =>
+            await Shell.Current.DisplayAlert(
+                "Point Saved Locally — Sync Needs Attention",
+                $"Point #{e.Point.Id} remains on this device and was not uploaded. Reason: {e.ReasonCode}.",
+                "OK"));
 }